Concrete-mixer.



,No. 882,830. PATENTED MAR. 24, 1908.

J. D. LUTTRBLL.

CONCRETE MIXER.

APPLICATION FILED JAN,25,1907.

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wi/lwwooeo %%7 i l atkozmgo I No. 882,830. PATENTED MAR. 24, 1908.

J. D. LUTTRELL.

CONCRETE MIXER.

APPLIOATION FILED JAN,25,1907.

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wi/livwooeo UNITED STATES PATENT OFFICE.

JOHN D. LI'TTR-ELL, OF BENTON HARBOR, MICHIGAN, ASSIGNOR TO ELMER M. BARNES, OF

4 ST. JOSEPH. MICHIGAN.

CON CRE TE-MIXER.

Specification of Letters Patent.

Patented March 24, 1908.

Application filed January 25, 1907. Serial No. 354,055..

T 0 all whom it may concern:

Be it known that I, JOHN D. LUTTRELL, a subject of the King of Great Britain, and a resident of Benton Harbor, Michigan, have invented a certain new and useful Improvement in Concrete-Mixers, of which the following is a specification.

My invention relates to mixers, and more especially to that class-of mixers for mixing the ingredients of concrete, and consistsof means whereby the heavier particles of the mixture are so combined with the lighter portions that the two cannot become unequally distributed and separated, as fully set forth hereinafter and as illustrated in the accompanying drawing, in which Figure 1 is a sectional elevation of a mixer specially adapted for concrete and embodying my invention. Fig. 2 is a sectional plan on the line 22, Fig. 1. Figs. 3 and 4 are perspective views of different elements of the stirrers.

The frame of the ap aratus is of any suitable construction but has a trough or pan B suitably mounted, and above this pan is a cross-head C rotatable about a central vertical axis. As shown there is a stationary post 1, about which turns a sleeve 2 to which the cross head C is fixed, the sleeve being closed at its upper end and resting upon a ball bearing at the top of the post 1, and being provided with a gear 3 engaging a gear ion a driving shaft 5 suitably supported by the frame.

To one arm 6 of the cross head O is suspended a rake D having vertical teeth 8, curved and touching the bottom of the pan at their lower ends, and to the other arm 9 of the cross-head is pivoted a stirrer E in the form of a curved grid having horizontal bars 10, the lower edge also resting on the bottom of the pan.

The sleeve 2 is provided with a bracket 12 on which is sup orted a water tank F having a port at the ottom communicating with a spray device G and with a valve 13, and means for o ening and closing it, and to the sleeve 2 is pivoted at a: a box H, having a perforated bottom and sliding valve 19. An arm 14, 15 that pan B.

,The above described apparatus is intended ears on the serrated edge 16 of the endent from box H, carries a roller cement is much heavier than sand and that when cement and sand are deposited simultaneously in a receptacle and agitated, the cement will quickly find its way to the bottom and remain there, the sand rolling over without mixing with the cement, so that but.

a very imperfect mixture is secured with a detrimental want of uniformity in the result. By the above described a paratus I avoid this result, inasmuch as tllfe sand is in the first instance placed in the pan B in the desired quantity and the proper proportion of cement is placed in the box H, and the apparatus is then put in operation, the valves 13 and 19 being open;

As thesleeve 2 revolves, the box H is agitated from the travelin of the roller 15 over the serrated edge 16 and the cement is gradually deposited upon the body of the sand. The latter is agitated in one direction by the curved teeth 8 of the rake D and broken up in the opposite direction by the horizontal bars of the rid F so that the particles are thoroughly istributed and agitated in their relative positions durin the time that the cement is being gradua 1y spread over the top and thus intimately mixed with the particles of sand, while at the same time the wa ter is sprayed upon the matter in the pan, and as this sprayin occurs before the cement has time to fin, its wa to the bottom, it tends to cause the partic' es of cement to adhere to the particles of sand, with the result that by the time the box H is emptied, the particles of cement and sand have become uniformly distributed among each other and there is a regular and uniform mixture in the an. It Wlll be seen that the teeth of the ra e D serve to divide the mass of the mixture on vertical lines, while at the same time, as they are curved, they tend to-carry mixing blades may be employed in connection with the means for l ited therein, and means for rotating the feeding the cement gradually to sand, and that other means may be employed for spraying the water and for agitating the cement box or receptacle.

The contents of the pan may be removed in any suitable manner, but preferably a portion 21 of the bottom is hinged so that it can be swun down, and is held in a horizontal position y a vertical catch 22.

Without limiting myself therefore to the precise construction and parts shown I claim as my invention:

connected with said arrangement of 3 1. In amixing apparatus the combination 1 of a pan, a shaft arranged centrally in re- I spect to the pan, mixers carried by the shaft,

- a receptacle havin a perforated bottom for a pulverized materia means for agitating the receptacle, means for spraying water upon the material in the pan as gradually deposthe mass of shaft together with the receptacle.

2. The combination of the pan, a rotatable cross-head, a curved rake and a curved grid cross-head, a water tank, and a receptacle having a perforated bottom supported to rotate with the cross head, and means for agitating the receptacle.

3. The combination with the pan having a serrated edge, its spraying device and receptacle having a perforated bottom, of a bracket extending over the receptacle and provided with a roller resting upon the edge of the pan.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN D. LUTTRELL.

\Yitnesses:

A. I. Canr, LEONA II. WISE. 

